Precision Drilling-Type Underreamer Tools Built to Perform

An under reamer is a drilling tool used to enlarge a borehole below an existing restriction, casing, pilot hole, or previously drilled section. In drilling applications, it helps create a larger finished diameter while maintaining control, stability, and bore quality. Under reaming is commonly used when the pilot hole is smaller than the required final bore.

An under reamer is generally used to enlarge a hole below a constrained section or within a bore where a larger diameter is needed after the pilot path is established. A hole opener is typically run to enlarge an existing pilot hole more generally. Both support bore enlargement, but tool geometry, cutting structure, and application requirements differ.

The purpose of reaming is to enlarge, smooth, or finish an existing hole to a required diameter. In drilling, reaming improves bore consistency, supports cleaner hole geometry, and can reduce problems such as chatter, fluctuating torque, or poor cuttings evacuation. Proper reaming helps achieve a more predictable finished bore across varied ground conditions.

A Drilling-Type Underreamer is commonly used in oil and gas, geothermal, waterwell, construction, horizontal directional drilling, and mining projects. It is especially valuable when a pilot bore must be expanded efficiently, when hole symmetry matters, or when softer drilling conditions require controlled fluid volume and stable cutting performance.

Infinity Tool MFG can support custom reaming requirements through its in-house engineering and drafting team. Useful specifications include desired hole diameter, pilot size, thread connection, ground conditions, quantity, drilling method, and any special performance goals. These details help determine cutter layout, tool body design, and machining requirements.

Choosing the right reamer depends on formation type, pilot bore size, required finished diameter, rig capacity, drilling fluid volume, and connection requirements. PDC reamers may suit specific reaming conditions, while tricone or DTH hole openers may be better for other applications. Infinity Tool MFG can help match tooling to your drilling environment.

PDC reamers use polycrystalline diamond compact cutters and are designed for efficient cutting, reduced chatter, and smoother torque response in suitable conditions. Tricone hole openers use roller cone cutting structures and are often selected for different formations or drilling styles. The best choice depends on ground conditions, equipment, and production goals.

To request pricing, provide the tool diameter, thread connection, pilot and finish bore requirements, ground conditions, drilling application, quantity, and any special design notes. These details allow the team to evaluate whether a standard reaming product fits or whether a custom engineered solution is the better option.